Add a word "Test" to metering test classes

All test class except metering test classes contains "Test" in their
names. This patch adds the word to metering test classes for clarifying
the test classes.

Change-Id: I8d42d73464a94f5229ff7065404bbf3b402c75c7
Merge "Add a word "Test" to metering test classes"
Change neutron client methods to return one value and update tests

Also removed redundant ok checks in javelin.py and put in a work-around
for the existing assumption that all client 'list_' methods have the same
signature.

It was necessary to change the mocked network calls in the unit tests.
Since the mocked status is never referenced, it was just removed.

Partially implements: blueprint clients-return-one-value

Change-Id: I76de07e984f13e3eec4977a4d823d1ef367e8f46
Fix slowest test output after test run

This commit fixes the output from pretty_tox.sh so that the testr
slowest output isn't gobbled up by the pipe into subunit-trace.

Change-Id: I11e8fe80c35a1d3a90a4d7c8bf2b36c4114b5cc6
Merge "Change neutron client methods to return one value and update tests"
Merge branch 'master' of https://github.com/openstack/tempest